What Are EN 10255 Fire Sprinkler Pipes?

EN 10255 fire sprinkler pipes​ are non-alloy welded steel pipes manufactured to the European standard EN 10255 and widely used in water-based fire sprinkler systems. The standard defines non-alloy steel tubes suitable for welding and threading, classified into Light (L, L1, L2), Medium (M), and Heavy (H) series​ by wall thickness. The Heavy series, with its greater wall thickness, is commonly specified for fire sprinkler and fire protection applications where robust mechanical performance is required. The most widely used steel grade is S195T—the “T” indicating the steel is optimized for threading.

Material & Standard Overview

EN 10255 (formerly BS 1387) is a European standard for non-alloy steel pipes suitable for welding and threading. The grade S195T​ (steel grade 1.0026) is the dominant choice for fire sprinkler service:

• Yield strength: ≥ 195 MPa
• Tensile strength: 320–520 MPa
• Key advantage: The “T” suffix confirms the steel’s metallurgical composition is optimized for clean, leak-free mechanical threading.

Applications: Where Are EN 10255 Fire Sprinkler Pipes Used?

EN 10255 S195T welded tubes are widely used in water-based fire suppression systems, including:

• Wet pipe sprinkler systems​ – most common, water-filled piping
• Dry pipe sprinkler systems​ – requires hot-dip galvanized finish
• Pre-action systems​ – for high-value asset protection
• Deluge systems​ – high-hazard industrial areas

Beyond fire protection, EN 10255 pipes also serve water supply lines, gas distribution, HVAC/chilled water systems, and compressed air systems.

Why Choose EN 10255 Heavy Series for Fire Sprinkler Systems?

• ✅ Thread-friendly material​ – S195T grade ensures smooth, leak-free threading without die wear
• ✅ Robust wall thickness​ – Heavy series provides superior mechanical protection for exposed networks
• ✅ Versatile connections​ – Suitable for welded, threaded (NPT/BSPT), or roll-grooved joints
• ✅ Corrosion options​ – Hot-dip galvanized (≥85 μm per ISO 1461) for outdoor/dry systems; red-painted black pipe for indoor wet systems
• ✅ FM Approved available​ – Meets international fire code requirements
• ✅ Full traceability​ – EN 10204 Type 3.1 mill certificate with every shipment

EN 10255 vs. Other Fire Sprinkler Pipe Standards

For projects specifying EN 10255, the Heavy series with S195T grade​ is the recommended choice for fire sprinkler service.

Baolai International – Your EN 10255 Fire Sprinkler Pipe Supplier

At Tianjin Baolai International Trade Co., Ltd., we manufacture EN 10255 S195T fire sprinkler pipes​ with FM certification​ in our own group factories. Our product range includes:

• Series: Light (L2), Medium, and Heavy (H)​ — full spectrum
• Sizes: DN15–DN150 (½″–6″)
• Finishes: Black, Red-painted, Hot-dip galvanized, Epoxy-coated, Polyester powder
• Ends: Plain, Beveled, Roll-grooved, NPT threaded, BSPT threaded
• Certifications: FM Approved; EN 10204 Type 3.1 mill certificate; third-party inspection (SGS, BV, Intertek) available

With 8 ERW production lines​ and 5 hot-dip galvanizing lines, backed by 30+ years of steel manufacturing expertise and UL/FM dual-certified quality systems, we deliver EN 10255 fire sprinkler pipes that meet the most demanding European and international fire codes.

📞 Contact our sales team today for a quotation, technical datasheet, or to discuss your project’s specific EN 10255 requirements